Patent US1125946A successfully refreshed from Google Patents.
Patent US4266973A successfully refreshed from Google Patents.
US4266973A
Expired / Lapsed
US
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Tarnish-resistant gold color alloy and dental restorations employing same
Assignee: JM NEY COMPANY A CORP OF CONN
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Filing: 1979-12-14
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Granted: 1981-05-12
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Expires: 1999-12-14
Abstract
Abstract A tarnish-resistant gold color alloy comprises 30-50 percent by weight gold; 20-50 percent copper; 5-15 percent silver; 2-20 percent zinc; 1.5-15 percent palladium; up to 4.0 percent by weight platinum; and up to 1.0 percent by weight rhenium. The atomic ratio of copper to silver, copper to zinc and copper to palladium are respectively, 6-8:1; 2-12:1; and 5-30:1 and the weight ratios are respectively, 3.5-4.7:1; 3.0-18:1; and 1.95-11.66:1. Dental restorations comprising castings of the alloy have color values on the Hunter scale of L=80-90; a=2.5-3.5; and b=14-18. The dental restorations exhibit tarnish-resistant values of DE 1 less than 13 and DE 10 less than 20.
Inventors
- 👤 Matthew M. Guzowski
- 👤 Stephen P. Schaffer
- 👤 David C. Wright
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:12
CPC Classifications
C; C22; C22C; C22C30/00; C22C30/02; A; A61; A61K; A61K6/00; A61K6/80; A61K6/84; A61K6/844
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
108 words
A tarnish-resistant gold color alloy consisting essentially of: A. 30-50 percent by weight gold; B. 20-50 percent by weight copper; C. 5-15 percent by weight silver; D. 2-20 percent by weight zinc; E. 1.5-15 percent by weight palladium; F. up to 4.0 percent by weight platinum; and G. up to 1.0 percent by weight rhenium; the copper to silver atomic ratio being 6-8:1; the copper to zinc atomic ratio being 2-12:1; and the copper to palladium atomic ratio being 5-30:1; the weight ratio of copper to silver being 3.5-4.7:1; the weight ratio of copper to zinc being 3.0-18:1; and the weight ratio of copper to palladium being 1.95-11.66:1.
Claim 2
Dependent Claim
108 words
A tarnish-resistant gold color alloy consisting essentially of: A. 30-50 percent by weight gold; B. 20-50 percent by weight copper; C. 5-15 percent by weight silver; D. 2-20 percent by weight zinc; E. 1.5-15 percent by weight palladium; F. up to 4.0 percent by weight platinum; and G. up to 1.0 percent by weight rhenium; the copper to silver atomic ratio being 6-8:1; the copper to zinc atomic ratio being 2-12:1; and the copper to palladium atomic ratio being 5-30:1; the weight ratio of copper to silver being 3.5-4.7:1; the weight ratio of copper to zinc being 3.0-18:1; and the weight ratio of copper to palladium being 1.95-11.66:1.
Claim 3
Dependent Claim
19 words
The tarnish-resistant gold color alloy in accordance with claim 1 wherein there is included 0.5-1.5 percent by weight platinum.
Claim 4
Dependent Claim
73 words
The tarnish-resistant gold color alloy in accordance with claim 1 wherein the gold comprises 35-45 percent by weight, the copper comprises 33-43 percent by weight, the zinc comprises 5-10 percent by weight, the palladium comprises 2-8 percent by weight, the silver comprises 7-12 percent by weight; and wherein the copper to silver atomic ratio is 6.5-7.5:1, the copper to zinc atomic ratio is 4-6:1; and the copper to palladium atomic ratio is 14-18:1.
Claim 5
Dependent Claim
19 words
The tarnish-resistant gold color alloy in accordance with claim 3 wherein there is included 0.5-1.5 percent by weight platinum.
Claim 6
Dependent Claim
142 words
A dental restoration comprising a casting of an alloy consisting essentially of: A. 30-50 percent by weight gold; B. 20-50 percent by weight copper; C. 5-15 percent by weight silver; D. 2-20 percent by weight zinc; E. 1.5-15 percent by weight palladium; F. up to 4.0 percent by weight platinum; and G. up to 1.0 percent by weight rhenium; the copper to silver atomic ratio being 6-8:1; the copper to zinc atomic ratio being 2-12:1; and the copper to palladium atomic ratio being 5-30:1; the weight ratio of copper to silver being 3.5-4.7:1; the weight ratio of copper to zinc being 3.0-18:1; and the weight ratio of copper to palladium being 1.95-11.66:1; said casting having color values on the Hunter scale (D 65) of L=80-90; a=2.5-3.5; b=14-18; and tarnish-resistant values of DE 1 less than 13 and DE 10 less than 20.
Claim 7
Dependent Claim
142 words
A dental restoration comprising a casting of an alloy consisting essentially of: A. 30-50 percent by weight gold; B. 20-50 percent by weight copper; C. 5-15 percent by weight silver; D. 2-20 percent by weight zinc; E. 1.5-15 percent by weight palladium; F. up to 4.0 percent by weight platinum; and G. up to 1.0 percent by weight rhenium; the copper to silver atomic ratio being 6-8:1; the copper to zinc atomic ratio being 2-12:1; and the copper to palladium atomic ratio being 5-30:1; the weight ratio of copper to silver being 3.5-4.7:1; the weight ratio of copper to zinc being 3.0-18:1; and the weight ratio of copper to palladium being 1.95-11.66:1; said casting having color values on the Hunter scale (D 65) of L=80-90; a=2.5-3.5; b=14-18; and tarnish-resistant values of DE 1 less than 13 and DE 10 less than 20.
Claim 8
Dependent Claim
15 words
The dental restoration of claim 5 wherein there is included 0.5-1.5 percent by weight platinum.
Claim 9
Dependent Claim
84 words
The dental restoration of claim 5 wherein the gold comprises 35-45 percent by weight, the copper comprises 33-43 percent by weight, the zinc comprises 5-10 percent by weight, the palladium comprises 2-8 percent by weight, the silver comprises 7-12 percent by weight; and wherein the copper to silver atomic ratio is 6.5-7.5:1, the copper to zinc atomic ratio is 4-6:1; and the copper to palladium atomic ratio is 14-18:1; and wherein said alloy contains 0.5-1.5 percent by weight of a hardener consisting of platinum.
Claim 10
Dependent Claim
106 words
A tarnish-resistant gold color alloy consisting essentially of: A. 30-50 percent by weight gold; B. 20-50 percent by weight copper; C. 5-15 percent by weight silver; D. 2-20 percent by weight zinc; E. 1.5-15 percent by weight palladium; F. up to 4.0 percent by weight platinum; and G. 0.03-0.7 percent by weight rhenium; the copper to silver atomic ratio being 6-8:1; the copper to zinc atomic ratio being 2-12:1; and the copper to palladium atomic ratio being 5-30:1; the weight ratio of copper to silver being 3.5-4.7:1; the weight ratio of copper to zinc being 3.0-18:1; and the weight ratio of copper to palladium being 1.95-11.66:1.
Claim 11
Dependent Claim
106 words
A tarnish-resistant gold color alloy consisting essentially of: A. 30-50 percent by weight gold; B. 20-50 percent by weight copper; C. 5-15 percent by weight silver; D. 2-20 percent by weight zinc; E. 1.5-15 percent by weight palladium; F. up to 4.0 percent by weight platinum; and G. 0.03-0.7 percent by weight rhenium; the copper to silver atomic ratio being 6-8:1; the copper to zinc atomic ratio being 2-12:1; and the copper to palladium atomic ratio being 5-30:1; the weight ratio of copper to silver being 3.5-4.7:1; the weight ratio of copper to zinc being 3.0-18:1; and the weight ratio of copper to palladium being 1.95-11.66:1.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-05-11 | 1984-11-10 | 1985-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-11 | 1988-11-10 | 1989-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-11 | 1992-11-10 | 1993-05-12 | $7700.00 | Window Closed / Lapsed |